Uncertainty over the Brexit negotiations and a "shambolic" diesel policy has contributed to Jaguar Land Rover moving production to a three-day week at one of its plants, according to a manufacturing industry expert.

David Bailey, professor of industry at Aston Business School, said greater clarity was now needed over the UK's exit from the European Union and questioned whether similar announcements could be made about other JLR plants in the West Midlands.

The comments came as the luxury car maker announced it was moving to a three-day week at its Jaguar plant in Castle Bromwich, in north Birmingham.

The change comes with the car giant struggling as a result of Brexit and the fall in demand for diesel models.

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"In light of the continuing headwinds impacting the car industry, we are making some temporary adjustments to our production schedules at Castle Bromwich.

"We are however continuing to over-proportionally invest in new products and technologies and are committed to our UK plants in which we have invested more than £4 billion since 2010 to future proof manufacturing technologies to deliver new models."